The ring-ditch at Moneymore measures roughly twenty metres east to west and fifteen metres north to south, and it survives not as a visible earthwork but as a magnetic ghost, picked up only when surveyors swept the ground with a gradiometer, an instrument that detects subtle variations in the soil's magnetic properties caused by ancient digging and burning.

The feature is defined by a single fosse, the term for a cut ditch, which forms the enclosing element typical of a ring-ditch. Monuments of this type are most often associated with prehistoric funerary or ritual activity, though without excavation the function of any individual example remains an open question. What the survey did reveal is a wide entrance on the eastern side and what may be a scatter of pits within the interior, details that hint at deliberate, structured use of the space over time. The site sits at the bottom of a gentle north-facing slope, on the southern edge of a shallow natural basin approximately three hundred metres across. By 1835, when the Ordnance Survey produced its first detailed six-inch mapping of Ireland, a north-south access route already crossed directly over the spot, effectively sealing the monument beneath generations of foot and wheel traffic, and obscuring it from the surface entirely until a development survey brought it back into view.